What feature should extension cords have when used in damp locations?

The correct choice emphasizes the importance of using extension cords specifically designed for damp or wet locations, which is essential for safety in environments like healthcare facilities. Waterproof wires and connectors are crucial because they prevent moisture from entering the electrical components, thereby minimizing the risk of short circuits, electrical shocks, or fires that could result from exposure to water.

In damp environments, standard extension cords can pose significant dangers as they may not be insulated adequately against moisture. Using cords that have been engineered to be waterproof ensures not only compliance with OSHA regulations but also the safety of healthcare workers and patients who may be exposed to such risks.

Though other features like visibility or portability can offer benefits in different contexts, they do not directly address the electrical safety concerns presented by moisture, which is paramount in healthcare settings. A high wattage rating might be relevant for determining the capacity of the cord, but it does not necessarily improve safety in terms of moisture management in damp locations.